today i tried to play killing floor again, since last time I tried playing I had a massive issue. Whenever I joined a server, after around 10 seconds it crashed, and the zombies and people just walked straight on into walls, and time froze as well. I could play solo perfectly.

I tried again today and I still have the same issue. I am able to play absolutely every game fine online, just killing floor has a problem. I heard it might be because of my router. iam using a macbook 7.1